SMTPClient disconnects following STARTTLS

Burak Arslan <[email protected]> Tue, 5 Feb 2019 18:15:27 +0300

Newsgroups	gmane.comp.python.twisted
Message-ID	<[email protected]>

Hello,

I'm trying to deliver mail using twisted.mail.sendmail (version 18.9.0)

Delivery attempts to some servers fail either with disconnections or
timeouts following the STARTTLS command. When I disable STARTTLS (by
patching tryTLS()) message delivery succeeds.

So is there a way to log the TLS handshake process to be able to
understand why the TLS connection cannot resume? Any suggestions for
troubleshooting this? A dry ConnectionDone doesn't tell much.

Is it possible to make t.m.sendmail() attempt another delivery without
STARTTLS?

Best regards,
Burak ARSLAN


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